混凝土用水性氟碳涂料的制备及耐腐蚀性能评价
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摘要
以含氟聚丙烯酸酯乳液为主要成膜物质,添加分散剂、润湿剂、消泡剂等功能助剂制备了一系列混凝土用防腐蚀水性氟碳涂料,重点研究了含氟乳液用量和钛白粉用量对涂层基本性能的影响,综合涂层吸水率、氯离子渗透试验、扫描电镜、紫外老化等结果对其耐水性、耐腐蚀性和耐紫外老化性能结果,考察其对混凝土的防护作用。结果表明乳液用量45%,钛白粉用量25%时成膜效果较好,涂层的附着力为2.18 MPa,铅笔硬度为4H。水性氟碳涂料的使用能显著降低混凝土试件的吸水率及氯离子渗透性,吸水率降至为0.74%,通电6h的总导电量由4163C降为1636C;氟碳涂层经5%NaCl溶液(14d)、10%H_2SO_4溶液(14d)和10%NaOH溶液(21d)腐蚀后的腐蚀率分别为28%,47%和12%,耐酸碱盐腐蚀性较好;紫外老化1000 h后的亮度色差?L~*值为13.3,适用于腐蚀环境下混凝土的长效防护。
A series of waterborne fluorocarbon coatings were prepared from fluoroacrylate emulsion as film-forming material together with other additives such as dispersant,wetting agent and the defoaming agent.The effects of emulsion amount and pigment loading on the coating properties were discussed.The water resistance,corrosion resistance and UV aging resistance of the fluoroacrylate coating were analyzed by water absorption,chloride ion permeation test,scanning electron microscopy(SEM)and UV aging to inspect the protective effect on concrete.The results showed that the film forming was best when the emulsion dosage was 45% and titanium dioxide dosage was 25%.The adhesion of the coating was 2.18 MPa and the pencil hardness was 4 H.The waterborne fluorocarbon coating can significantly reduce the water absorption rate and chloride ion permeability of the concrete,the water absorption rate is reduced to 0.74%,and the total electric conductivity is reduced from 4163C to 1636C after 6 hours of electricity.The corrosion percentage of fluorocarbon coating after 5% NaCl solution(14d),10%H_2SO_4 solution(14d)and 10% NaOH solution(21 d)was 28%,47% and 12%,respectively.The corrosion resistance of fluorocarbon coating to acid,alkali,and salt was relatively good.The color difference after UV aging for 1000 h is 13.3,which is suitable for long-term protection of concrete under corrosive environment.
A series of waterborne fluorocarbon coatings were prepared from fluoroacrylate emulsion as film-forming material together with other additives such as dispersant,wetting agent and the defoaming agent.The effects of emulsion amount and pigment loading on the coating properties were discussed.The water resistance,corrosion resistance and UV aging resistance of the fluoroacrylate coating were analyzed by water absorption,chloride ion permeation test,scanning electron microscopy(SEM)and UV aging to inspect the protective effect on concrete.The results showed that the film forming was best when the emulsion dosage was 45% and titanium dioxide dosage was 25%.The adhesion of the coating was 2.18 MPa and the pencil hardness was 4 H.The waterborne fluorocarbon coating can significantly reduce the water absorption rate and chloride ion permeability of the concrete,the water absorption rate is reduced to 0.74%,and the total electric conductivity is reduced from 4163C to 1636C after 6 hours of electricity.The corrosion percentage of fluorocarbon coating after 5% NaCl solution(14d),10%H_2SO_4 solution(14d)and 10% NaOH solution(21 d)was 28%,47% and 12%,respectively.The corrosion resistance of fluorocarbon coating to acid,alkali,and salt was relatively good.The color difference after UV aging for 1000 h is 13.3,which is suitable for long-term protection of concrete under corrosive environment.
引文
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[2]潘莉莎,李嘉诚,史载锋,等.热带海洋气候地区混凝土耐久性研究[J].混凝土世界,2016,(8):96-99.
[3]李敏风,韩利世.氟碳面漆在桥梁建造中的应用[J].电镀与涂饰,2018,37(6):263-267.
[4]房亚楠,秦立光,赵文杰,等.氟碳涂料在防腐领域的研发现状和发展趋势[J].中国腐蚀与防护学报,2016,36(2):97-106.
[5]薛晓芳,仇铄,蒋正武.混凝土结构用复合氟碳防护涂料的性能评价[J].新型建筑材料,2015,42(9):15-18.
[6]黄庆鑫,朱谱新,林义.基于FEVE树脂的含氟光固化树脂的合成[J].化学研究与应用,2015,27(8):1204-1207.
[7]吕太勇,刘波,罗源军,等.水溶性氟碳涂料的研究进展[J].化工新型材料,2016,44(9):45-46.
[8]武德涛,师华.水性氟碳涂料体系在混凝土防腐中的应用[J].涂料技术与文摘,2013,34(11):28-31.
[9]吴士军,李伟华,朱燕群,等.氟碳涂层体系对混凝土防护效果的研究[J].涂料工业,2014,44(11):64-67.
[10]段衍鹏,赵云鹏,刘景,等.含氟丙烯酸乳液涂料的制备及其在混凝土防护中的应用[J].涂料工业,2016,46(4):72-77.
[11]郑焱,毛倩瑾,王亚丽,等.水性氟碳涂料对混凝土防护作用的研究[J].化学工业与工程,2012,29(4):21-25.
[12]范波波.建筑混凝土用防腐蚀氟碳树脂涂料的制备及涂层性能研究[D].天津:河北工业大学,2008.
[13]邢云青,刘志刚,杨立荣,等.白水泥改善水性氟碳涂料性能的研究[J].硅酸盐通报,2016,35(3):852-855.
[14]Wang X,Hu J,Li Y,et al.The surface properties and corrosion resistance of fluorinated polyurethane coatings[J].J Fluor Chem,2015,176:14-19.
[15]Zhang G,Xie Q,Ma C,et al.Permeable epoxy coating with reactive solvent for anticorrosion of concrete[J].Progr Orga Coat,2018,117:29-34.
[16]王秀丽,付聪丽,余先魏,等.含氟丙烯酸酯共聚物表面性能的稳定化研究[J].化学研究与应用,2019,31(1):65-71.
[17]习娟,张存社,王前进,等.核壳型含氟丙烯酸酯乳液的制备及其氟碳涂料涂层的性能[J].材料保护,2015,48(2):61-63.
[18]于雪艳,陈正涛,李旭朝,等.常温固化氟碳涂料耐老化性能研究[J].涂料工业,2014,44(2):21-27.
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